Question

For each circuit in Fig. 27-20, are the resistors connected in series, in parallel, or neither?

Short answer

Fig $27.20a$series

Fig$27.20b$parallel

Fig$27.20c$parallel

Step-by-step solution

Given

Determining the concept

Observe the fig. carefully. If the resistances are one below the other, they are connected in parallel and if connected one after the other, they are in series.

Determining whether resistances are in series, parallel, or neither

Here, in fig $27.20a,$resistances are connected in series because they are wired one after another in a chain.

Hence, Series arrangement is shown below.

Here, in fig$27.20b,$resistances are connected in parallel because they are not wired one after another in a chain.

Hence, parallel arrangement is shown below.

Here, in fig$27.20c,$resistances are connected in parallel because they are not wired one after another in a chain.

Hence, parallel arrangement is shown below.

Therefore, if resistances are connected in a chain, they are in series, and the ones, which are not, are in parallel.